Sharing data

We don't allow users to open up their private folders using file system permissions or access control lists. This because managing these correctly can be complicated and can easily lead to security problems, where users accidentally share data. If you want to share data on Hábrók with other users, there are two options.

A group directory is useful if you want to share data with a group of users and the other cluster users should not have access to that data. Group directories are created on /scratch for data that needs to be processed and or on /projects for data that needs to be stored safely.

For working with this data there are two models:

1. The files in the shared folder are readable and writable for all group members.
2. There is a data manager that manages the data in the shared folder, and this data manager is the only person with full write access. All other group members can only read the data.

If you want to request a group directory, please contact hpc@rug.nl and let us know how much space you ideally would like to have (there are limits on what we can assign), which users should be part of the group, and what name you would like to assign to the directory/group.

Sometimes you need to share non-sensitive, public data with someone else. For this we have set up a directory /scratch/public. The data in this directory can be read by all users on the cluster.

Since we have allocated limited space to this directory a cleanup script will remove data after 30 days. Please let us know if you need to share data for a longer period. We can then create a group directory or move the data to a more permanent public location.